Transferred to Kiefferulus by Epler (1995).
Pupa: Rows of needle-like spines on sternites I-III, and a larger caudolateral spur on tergite VIII than K. dux.
Fourth instar larva: A typical Kiefferulus larva with one pair of ventral tubules. Epler gives postmentum length (shorter than VHL) as 255-290 µm, fewer than 75 striae on ventromentum, basal antennal segment 75-98 µm long. Premandible with 5 teeth. He notes that it differs from K. dux (see below) only by its smaller size.Found: District of Columbia - Little Falls (Townes 1945).
This species belongs to that section of Kiefferulus in which the anal struts of the adult male are separate and extend posteriorly. Such species have been placed in the subgenus Wirthiella, as Elper (2001) did with this species. However, it is currently disputed as to whether Wirthiella can be maintained as a subgenus, since no consistent characters seem to exist for any other life stage.